Hook type rotary latch



Sept. 29, 1942.

v W. A.v ENDTER HOOK TYPE ROTARY LATCH 3 Sheets-Sheet 1 Filed .Aug. 51,. 1940 HTTOH/YEI sept. 29, 1942.

w. A. ENDTER.

HOOK TYPE ROTARY LATCH Filed Aug. 31, 1940 5 Sheets-Sheet 2 Ilm/vrai; W1, DEM/m Il. Enorm BY- l 'SPL 2 9, 1942- l 'wg A. ENDTER 2,296,988 A HOOK 'TYPFl ROTARY LATCH v Filed Aug.. 31, 1940 3 Sheets-Sheet 3 Patented Sept. 29, 1942 UNITED STATES PATE-NT HOOK TYPE ROTARY LATCH Waldemar A.`Endter; Long Beach, Calif. Application August 31, 1940, Serial No. '355,059

` 5 Claims.

This invention relates to a rotary latch adapted to be used on various types 4of closures, and an object of my inventionuis ,to provide a `novel rotary Ilatch of the type in which the rotarybolt is retractable into the case, and is .provided with one or more cam dogstwhichengage the rotary bolt to urge this bolt into latching position.

. Another object ofI my, invention is to provide a novel rotary latch in which the rotary bolt is multi-headed, the heads being so constructed thatthey hook into Ithe keeper, and thus cannot be withdrawn until the cam dogs are released to allowy freeV rotation of the rotor. v Y

Still another object is tovpro'vide a novel rotary latch of the characterstated, in which a (Cl. 2924214) f' of a modified form of closure with still another modied form of latch mountedtherein. i

control dog is providedefor the purpose of tripvf pingthe rotor and urge this rotor in latching direction.A

- A feature of my invention resides in the novel construction of a multi-headed, revolving bolt, and a plurality of camdogs, one dog. acting in a groove and servingas al control .membe`r, and othercam. dogsY acting on the periphery of the revolving-bolt and serving to cam theboltin latching direction. f v

Other objects, advantages andY features of inl vention may yappear Yfrom the accompanying drawings, Ythe subjoined detailed the appended claims.

In the drawings:

description, and

Figure 1 is a fragmentary, transverse, sectional u,

viewfof4 a doorl with my .latch mounted therein, the latch being shownin ltransverse section.l

` Figure 2 is a fragmentary,l .transverse sectional view of the door. andlframe vshowing the latch as V,it first engages the keeper.

. Figure 3 is a View similarto Figure 2 showing A the'. rotary bolt enteringf'the recess in the. keeper. Figure 4.is atransverse, sectional View ,of the lower part of my rotary, .latch, with the dogs and rotor in positionfree of the keeper.

lowerpart. of my rotary latch, taken at right anglesto Figure.4. Y

Figure 6 is a transverse, sectional view of the v Figure 5 is a transverse, sectional view of the upper part of my, rotary latch. through whichv v the knob` spindle-extends'.

Figure '7 is aside elevation of one of the cam dogs.

vFigure 8 is an end view of the same.

Figure9 is a side elevation of another of the cam dogs.

Figure 10 is a side view of the same. Figure 11 is a` face view of the control dog. Figure 12 isan end View of the same.

,Referring more particularly to thel drawings, the numeral I indic'atesa lock case, and in this caselmount a U-shaped vyoke 2, which is slidable longitudinally inthe case." The yoke v2v slides in recesses or grooveways 3-'3, which `are formed in'the lock case.V `The yoke 2 is limited inv its movement inthe cas'eby suitable means, such as `engaging the face plate of thelock or by s means of la pair. of pins 4 4, which project from the yoke-and extend into slots in'the'side o f the case I. A` rotary bolt 5 is mounted inthe outer end of the yokei2 upon a pin 6, which is aixed Vor 'journaled in the yoke. The rotaryboltv isprovidedl with a pluralityof` spaced heads 1, the

fouter surface `of these heads being curved and concentric with the center of rotation .of the bolt. A'sshown in Figures 13v and 14, the heads 8 of the rotary bolt yare provided with eocentricouter faces 9, the purpose of which will b eivfurther described.A l Y,

Thejheads 'I yare equidistantly'spaced around thefrotor, and each head isprovided` with ahook or projection Il] on the leading edge, which hooks into the keeper ,for the purposegof Vmaking the "lock pick-proof, as will be `further described. A

groove is Vprovided in the rotor andithis groove is'formed with the samefnumber Vof vdwells VOr heads II, as provided on the rotor. The shape of the head II is somewhat diierent than the f heads 1,V the y.reason being 'to provide a means of tripping the bolt by an l yengaging cam dog, as will be furtherdescribed.

` t A plurality'ofcamdogs I2 are pivotally mounted in the` yoke 2 ona Vpin I3, whichfts in the yoke. The pivot ,pin I3 of the cam dogs'is arranged inwardly ofthe rotor 5, and one or more of the camdogs I4 is adapted to engage the outer face of the head 'IA of the rotary bolt, or the in- `4war'dl'y extending'. face I4 of a head' for the purpose of Ycamming the boltV in latching direction.

kA control dogV I5 .actson the head II and engages the head for the purpose of tripping the bolt, as Ywillv be subsequently described. .VI have ,ofthesp'rin'g 22.1 The control dog Ylat-chingr direction.

AYTheicamfdogs III .and

here shown a second cam dog I6, which also engages the outer surface of the head 1. The dog I6 is somewhat longer than the dog I4, and therefore these two dogs will act in succession, the shorter dog rst engaging the rear end of one of the heads 1 to cam the bolt in latching direction, and as the bolt rotates further in latching direction, the dog I6 will engage the rear end of one of the heads 1 and continue to urge the bolt in latching direction.

The control dog I5 is provided up lug I1, and the dog linger I3, and similarly the dog with a picky- V I4 is provided with a I6 is provided with a finger I9. The fingers I8 and VI9 arebent substantially at right angles tothe face-of the"` 15 dogs I4 and I6, and these `fingers extend over the lug I1 so that when thecontrol dogis' ref tracted, the dogs I4 and I6 will each be picked up by the fingers. I8 and I9 and moved away from the rotary bolt when the door is to be opened. v Y A retracting link extends from the inner end of the case I, and the outer end of this link is pivotally attached to the control dog I5, as shown at.2I. A coil spring 22 surrounds the retractinglink 20,.and bears against the yoke ,2 for the 'purpose of urging this yoke outwardly and alsoV urging the rotary bolt 5 outwardly against the keeper 23. The keeper.` may be a flat plate in which an opening 24 is ,cutv to receive one of the heads 1 of the rotary bolt. The hook. part YIll` of the bolt will fit into the keeper, as. shown `in `Figure when in locked position, and-the cam. dogs will hold the bolt in this position and constantlyurge thisboltclockwise, thus.; pressing the door or other closure in a closing direction against its stop.

-Themeans of actuating the, retracting link 20 from -a doorhandle is usual and well-known, and" may consist-v of a drag Yyoke 25, which engages -the innerV end ofthe drag link 20. A

spring 26Lbears against the part 25, and a cam `or finger 21v engages the drag yoke 25 for the purpose-of movingthe yoke inwardly when the handle is rotated. -The cam 2,1 is attached to orY is a part of the spindle drum 28, and the handlespindle extends through this drum in the `usualv and well-known ,mannen 'I'he cam dogs I4, I5 and I6 are each engaged by a spring 29, which urges the dogs against the rotor.

As shown in Figure 1, the latch is in position ready` to engage the keeper 23. In Figure 2, the dooris partly closed and the bolt 5 is riding against-the outer part of the keeper and the yoke 2-is partly, retracted, compressing the spring 22.v On further ,inward movement of the door,

Aone-of the heads 1 of the rotor will drop into 24 of the keeper due to the tension I5 now drops back, of oneofVV the high points in the groove, or heads --I I, and this dog will continue to urge the 'rotor in a clockwise direction. AThe cam dog the -opening I4has also dropped behind one o fY the heads of the,rotor,andis also camming this rotor in ^The main function of the control ,dog Y I5, is to, trip the rotary bolt at a denitepointwhile the dogs I4 Yand I6 are idle on .theperipheral surfaceof one ofthe heads 1. I6 will act successively against the.rotor,'continuing` to cam it in latch- Qing-.direction after the control dog hastripped therotor-y in latching direction, andY will hold the door-tightly against its stop. Since the dogs I6 hold 'the rotor substantially in the position shown in Figure 3, the hook part IIJ on heads Y8 also cam the rotor in latching direction,

the head of the rotor fits into the recess 24 and, therefore, the door and the frame cannot be pried apart, thereby making a pick-proof latch.

In order to open the door, the retracting link 20 is moved inwardly by the door handle, all of which is usual and well-known, and this inward movement will bring all of the cam dogs upwardly and away from the rotary bolt. The bolt is now free to rotate either clockwise or counterclockwise, and the door can easily be pulled open. 'Ihe inward movement of the retracting link 29 also pulls the yoke 2 inwardly a certain amount,

f thus permittingthe door to be swung open with- 'out hindrance from the hook I0.

Y When the handle. is released, the latch again returns to its normal position, as shown in Figure 1. The

headsY 1 are identical, and any one of them is adapted to engage the keeper.

InMFigures 13 and 14, the rotary bolt is not provided *with` a head II. The outer surfaces 9 of the heads are eccentric to the center of rotation of the latch, consequently the dogs will act directly on the peripheral surface 9, and will urge the rotary bolt to a dente tripping point the same as the control dog I5 acting on the head1 I, as previously described. The cam dogs acting on the eccentric outer surfaces 9 of the aswell as tripping the rotary head into the the rotor 38. An interengaging pick-up may also each head.

keeper in the same manner as previously described.

Itis to be understood that the main function of the control dog I5 is to control the tripping point of theV rotor and to trip this rotor either way, at a definite point while the other `dogs are idle on the peripheral surface of the heads 1.

YIn Figures 15 and 16,1 have disclosed a modifiedV form of rotor 30, which consists of a plurality of spaced heads 3l, these heads being also spaced transversely, leaving a groove 32. A plurality of pins 3 3 are mounted in the groove 32 between the heads 3I, and there is one pin for The pin is preferably positioned adjacent the periphery of the rotary bolt, and is engaged by the control dog I5 for the purpose of tripping the rotor in the same manner as previously described.

In Figure 17, a modified form of latch is disclosed which is mounted in a closureV 34, the closure operating in a housing 35. The latch consists of a yoke 36, which is pivotally mounted in the closure 34 on a pin 31. A multi-headed rotor 38 is journaled on the outer edge of the yoke 36, and the rotor cooperates with a keeper or keeper recess 39. A plurality of cam dogs 40 are also pivotally mounted on the pin 31, and these cam Ydogs cooperate with and Aengage the various heads of the rotor 38 for the purpose of camming this rotor into the keeper 39. One of the dogs is provided with an ear 4I, to which a handle shaft 42 is pivotally attached. The handle shaft extends out of the closure and isfmanually operated to retract the cam dogs 4Il,Y and lalso to swing the yoke 36 inwardly on its pivot when the door or closure is being opened. When the cam dogs 40 are retracted by the handle shaft 42, one of the dogs will engage a lug 43 on the yoke, thus causing the yoke to swing on its pivot after the dogs have been retracted from be provided on the cam dogs in vsubstantially the same manner as` ,previously described. A spring 44may surround the shaft 42 and bear against the ear 4I for the purpose of swinging the dogs and the yoke into latching position.

In Figure 18, a yoke 45 is pivotally mountedon the pin 46 in the closure 41. A multi-headed rotary bolt 48 is journaled in the yoke 45, and cooperates with a-keeper or keeper recess 49 to hold the closure in latched position. A dog l) is journaled on a pin 5I in the yoke 45. The pin 5| is spaced from the pin 46, substantially as shown. A vhandle shaft 52 is pivotally attached to the outer end of the dog 50, and is actuated by a handle 53. A spring 54 engages the yoke 45, and urges this yoke into latching position. A second spring 55 engages the dog 50 and urges this dog into engagement with any of the heads of the rotor 48 for the purpose of camming this rotor into the keeper.

Having described my invention, I claim:

1. A rotary latch comprising a case, a yoke slidably mounted in said case, a rotary bolt journaled in the yoke, a plurality of heads on the rotary bolt, one or more cam dogs pivotally mounted in the yoke, means to retract said cam dogs, spring means bearing against said yoke, spring means bearing against the cam dogs, said rotary bolt having a slot cut therein, and said slot having a cam surface, one of said dogs entering the slot and engaging the cam surface therein.

2. A rotary latch comprising a case, a yoke slidably mounted in said case, a rotary bolt journaled in the'yoke, a plurality of heads on the rotary bolt, one or more cam dogs pivotally mounted in the yoke, means to retract said cam dogs, spring means bearing against said yoke, spring means bearing against the cam dogs, said rotary bolt having a slot cut therein, and said slot having a cam surface, one of said dogs entering the slot and engaging the cam surface therein, each of the heads of the rotary bolt having a projection thereon adapted and arranged to hook into a keeper.

3. A rotary latch comprising a case,4 a yoke slidably mounted in said case, a rotary bolt journaled in the yoke, a plurality of identical heads on the rotary bolt, dogging means mounted on the yoke and engageable With the rotary bolt whereby said rotary bolt is held against reverse rotation, means to simultaneously retract the dogging means, spring means bearing against the yoke, spring means bearing against said dogging means, said rotary bolt having a slot formed therein, and a cam .surface in the slot, one of said dogging means entering the slot and engaging the cam surface therein.

4. A rotary latch comprising a case, a yoke slidably mounted in said case, a rotary bolt journaled in the yoke, a plurality of identical heads on the rotary bolt, dogging means mounted on the yoke and engageable with the rotary bolt whereby said rotary bolt is held against reverse rotation, means to simultaneously retract the dogging means, spring means bearing against the yoke, spring means bearing against said dogging means, said rotary bolt having a slot formed therein, and a cam surface in the slot, one of said dogging means entering the slot and engaging the cam surface therein, each of the heads of the rotary bolt having a hook-like projection thereon engageable with a keeper.

5. A rotary latch comprising a case, a yoke in said case, a rotary bolt journaled in the yoke, a plurality of heads on' the rotary bolt, one or more cam dogs pivotally mounted in the yoke,

means to retract said cam dogs, spring meansV bearing against said yoke, spring means bearing against the cam dogs, said rotary bolt having a slot cut therein, and said slot; having a cam surface, one of said dogs entering the slot and engaging the cam surface therein.

WALDEMAR A. ENDTER. 

